Duralactin Feline L-lysine is a highly palatable paste preferred by both healthy cats and cats in isolation for respiratory signs. Give directly or mix with food. Each syringe is notched and marked for individual dose. One syringe will treat one cat twice a day for a week. Usually need 2 to 3 syringes per cat for treatment. Results seen in 4-7 days with peak effects in 10-14 days. Does not suppress immune system.